ORIGINAL: Charlie P.
Oh - PS - servo buzzing can just be the natural complaining of a digital servo or may indicate a servo that is binding because of stiff conrol play. If you ever watch a voltmeter in the circuit you will see buzzing can mean power is being consumed at a high rate. Address that, too. A little is OK. A lot is bad news. For the servo and your receiver battery life.
Ya, my servos only buzz, if I push the control sticks all the way. So it's okay like that?